[Feature] I hope to support the setting function of web footer and be able to set registration number and other information

### MaxKB Version

v1.10.7

### Please describe your needs or suggestions for improvements

希望支持网页页脚的设置功能，能够设置备案号等信息

![Image](https://github.com/user-attachments/assets/dab2936d-e45b-4550-bed3-621a8616b66e)

### Please describe the solution you suggest

_No response_

### Additional Information

_No response_